API / Apache FreeMarker Interview questions

What is the purpose of TemplateLoader, and what types are available?

TemplateLoader is the abstraction that decides where template source text actually comes from, so Configuration.getTemplate() never needs to know or care whether a template lives on disk, inside a jar, or in memory.

Implementation	Loads templates from
FileTemplateLoader	A directory on the filesystem
ClassTemplateLoader	The Java classpath - convenient when templates are packaged inside a jar
StringTemplateLoader	In-memory strings registered programmatically - handy for tests or dynamically generated templates
MultiTemplateLoader	A chain of other TemplateLoaders, tried in order until one finds the template

The freemarker-servlet extension additionally provides a webapp-aware loader that reads templates from a web application's resource path. Choosing the right loader (or combination, via MultiTemplateLoader) is what lets the same application ship templates inside a jar for production while still allowing a filesystem override during local development.

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What problem does TemplateLoader solve for Configuration.getTemplate()?It abstracts away where template source text actually comes from

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It manages the HTTP session between requests

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It compiles the AST into bytecode

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It formats dates and numbers for the current locale

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Which TemplateLoader is most convenient when templates are bundled inside a jar file?MultiTemplateLoader used alone with no delegates

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StringTemplateLoader

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ClassTemplateLoader

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FileTemplateLoader

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